2 * Copyright 2002-2018 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
12 #include <openssl/err.h>
13 #include <openssl/asn1t.h>
14 #include <openssl/objects.h>
15 #include "internal/nelem.h"
16 #include "crypto/asn1_dsa.h"
20 int EC_GROUP_get_basis_type(const EC_GROUP
*group
)
24 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group
)) !=
25 NID_X9_62_characteristic_two_field
)
26 /* everything else is currently not supported */
29 /* Find the last non-zero element of group->poly[] */
31 i
< (int)OSSL_NELEM(group
->poly
) && group
->poly
[i
] != 0;
36 return NID_X9_62_ppBasis
;
38 return NID_X9_62_tpBasis
;
40 /* everything else is currently not supported */
44 #ifndef OPENSSL_NO_EC2M
45 int EC_GROUP_get_trinomial_basis(const EC_GROUP
*group
, unsigned int *k
)
50 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group
)) !=
51 NID_X9_62_characteristic_two_field
52 || !((group
->poly
[0] != 0) && (group
->poly
[1] != 0)
53 && (group
->poly
[2] == 0))) {
54 ECerr(EC_F_EC_GROUP_GET_TRINOMIAL_BASIS
,
55 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED
);
65 int EC_GROUP_get_pentanomial_basis(const EC_GROUP
*group
, unsigned int *k1
,
66 unsigned int *k2
, unsigned int *k3
)
71 if (EC_METHOD_get_field_type(EC_GROUP_method_of(group
)) !=
72 NID_X9_62_characteristic_two_field
73 || !((group
->poly
[0] != 0) && (group
->poly
[1] != 0)
74 && (group
->poly
[2] != 0) && (group
->poly
[3] != 0)
75 && (group
->poly
[4] == 0))) {
76 ECerr(EC_F_EC_GROUP_GET_PENTANOMIAL_BASIS
,
77 ERR_R_SHOULD_NOT_HAVE_BEEN_CALLED
);
92 /* some structures needed for the asn1 encoding */
93 typedef struct x9_62_pentanomial_st
{
99 typedef struct x9_62_characteristic_two_st
{
104 /* NID_X9_62_onBasis */
106 /* NID_X9_62_tpBasis */
107 ASN1_INTEGER
*tpBasis
;
108 /* NID_X9_62_ppBasis */
109 X9_62_PENTANOMIAL
*ppBasis
;
113 } X9_62_CHARACTERISTIC_TWO
;
115 typedef struct x9_62_fieldid_st
{
116 ASN1_OBJECT
*fieldType
;
119 /* NID_X9_62_prime_field */
121 /* NID_X9_62_characteristic_two_field */
122 X9_62_CHARACTERISTIC_TWO
*char_two
;
128 typedef struct x9_62_curve_st
{
129 ASN1_OCTET_STRING
*a
;
130 ASN1_OCTET_STRING
*b
;
131 ASN1_BIT_STRING
*seed
;
134 struct ec_parameters_st
{
136 X9_62_FIELDID
*fieldID
;
138 ASN1_OCTET_STRING
*base
;
140 ASN1_INTEGER
*cofactor
;
141 } /* ECPARAMETERS */ ;
143 struct ecpk_parameters_st
{
146 ASN1_OBJECT
*named_curve
;
147 ECPARAMETERS
*parameters
;
148 ASN1_NULL
*implicitlyCA
;
150 } /* ECPKPARAMETERS */ ;
152 /* SEC1 ECPrivateKey */
153 typedef struct ec_privatekey_st
{
155 ASN1_OCTET_STRING
*privateKey
;
156 ECPKPARAMETERS
*parameters
;
157 ASN1_BIT_STRING
*publicKey
;
160 /* the OpenSSL ASN.1 definitions */
161 ASN1_SEQUENCE(X9_62_PENTANOMIAL
) = {
162 ASN1_EMBED(X9_62_PENTANOMIAL
, k1
, INT32
),
163 ASN1_EMBED(X9_62_PENTANOMIAL
, k2
, INT32
),
164 ASN1_EMBED(X9_62_PENTANOMIAL
, k3
, INT32
)
165 } static_ASN1_SEQUENCE_END(X9_62_PENTANOMIAL
)
167 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL
)
168 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_PENTANOMIAL
)
170 ASN1_ADB_TEMPLATE(char_two_def
) = ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.other
, ASN1_ANY
);
172 ASN1_ADB(X9_62_CHARACTERISTIC_TWO
) = {
173 ADB_ENTRY(NID_X9_62_onBasis
, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.onBasis
, ASN1_NULL
)),
174 ADB_ENTRY(NID_X9_62_tpBasis
, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.tpBasis
, ASN1_INTEGER
)),
175 ADB_ENTRY(NID_X9_62_ppBasis
, ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, p
.ppBasis
, X9_62_PENTANOMIAL
))
176 } ASN1_ADB_END(X9_62_CHARACTERISTIC_TWO
, 0, type
, 0, &char_two_def_tt
, NULL
);
178 ASN1_SEQUENCE(X9_62_CHARACTERISTIC_TWO
) = {
179 ASN1_EMBED(X9_62_CHARACTERISTIC_TWO
, m
, INT32
),
180 ASN1_SIMPLE(X9_62_CHARACTERISTIC_TWO
, type
, ASN1_OBJECT
),
181 ASN1_ADB_OBJECT(X9_62_CHARACTERISTIC_TWO
)
182 } static_ASN1_SEQUENCE_END(X9_62_CHARACTERISTIC_TWO
)
184 DECLARE_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO
)
185 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(X9_62_CHARACTERISTIC_TWO
)
187 ASN1_ADB_TEMPLATE(fieldID_def
) = ASN1_SIMPLE(X9_62_FIELDID
, p
.other
, ASN1_ANY
);
189 ASN1_ADB(X9_62_FIELDID
) = {
190 ADB_ENTRY(NID_X9_62_prime_field
, ASN1_SIMPLE(X9_62_FIELDID
, p
.prime
, ASN1_INTEGER
)),
191 ADB_ENTRY(NID_X9_62_characteristic_two_field
, ASN1_SIMPLE(X9_62_FIELDID
, p
.char_two
, X9_62_CHARACTERISTIC_TWO
))
192 } ASN1_ADB_END(X9_62_FIELDID
, 0, fieldType
, 0, &fieldID_def_tt
, NULL
);
194 ASN1_SEQUENCE(X9_62_FIELDID
) = {
195 ASN1_SIMPLE(X9_62_FIELDID
, fieldType
, ASN1_OBJECT
),
196 ASN1_ADB_OBJECT(X9_62_FIELDID
)
197 } static_ASN1_SEQUENCE_END(X9_62_FIELDID
)
199 ASN1_SEQUENCE(X9_62_CURVE
) = {
200 ASN1_SIMPLE(X9_62_CURVE
, a
, ASN1_OCTET_STRING
),
201 ASN1_SIMPLE(X9_62_CURVE
, b
, ASN1_OCTET_STRING
),
202 ASN1_OPT(X9_62_CURVE
, seed
, ASN1_BIT_STRING
)
203 } static_ASN1_SEQUENCE_END(X9_62_CURVE
)
205 ASN1_SEQUENCE(ECPARAMETERS
) = {
206 ASN1_EMBED(ECPARAMETERS
, version
, INT32
),
207 ASN1_SIMPLE(ECPARAMETERS
, fieldID
, X9_62_FIELDID
),
208 ASN1_SIMPLE(ECPARAMETERS
, curve
, X9_62_CURVE
),
209 ASN1_SIMPLE(ECPARAMETERS
, base
, ASN1_OCTET_STRING
),
210 ASN1_SIMPLE(ECPARAMETERS
, order
, ASN1_INTEGER
),
211 ASN1_OPT(ECPARAMETERS
, cofactor
, ASN1_INTEGER
)
212 } ASN1_SEQUENCE_END(ECPARAMETERS
)
214 DECLARE_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS
)
215 IMPLEMENT_ASN1_ALLOC_FUNCTIONS(ECPARAMETERS
)
217 ASN1_CHOICE(ECPKPARAMETERS
) = {
218 ASN1_SIMPLE(ECPKPARAMETERS
, value
.named_curve
, ASN1_OBJECT
),
219 ASN1_SIMPLE(ECPKPARAMETERS
, value
.parameters
, ECPARAMETERS
),
220 ASN1_SIMPLE(ECPKPARAMETERS
, value
.implicitlyCA
, ASN1_NULL
)
221 } ASN1_CHOICE_END(ECPKPARAMETERS
)
223 DECLARE_ASN1_FUNCTIONS(ECPKPARAMETERS
)
224 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECPKPARAMETERS
, ECPKPARAMETERS
)
225 IMPLEMENT_ASN1_FUNCTIONS(ECPKPARAMETERS
)
227 ASN1_SEQUENCE(EC_PRIVATEKEY
) = {
228 ASN1_EMBED(EC_PRIVATEKEY
, version
, INT32
),
229 ASN1_SIMPLE(EC_PRIVATEKEY
, privateKey
, ASN1_OCTET_STRING
),
230 ASN1_EXP_OPT(EC_PRIVATEKEY
, parameters
, ECPKPARAMETERS
, 0),
231 ASN1_EXP_OPT(EC_PRIVATEKEY
, publicKey
, ASN1_BIT_STRING
, 1)
232 } static_ASN1_SEQUENCE_END(EC_PRIVATEKEY
)
234 DECLARE_ASN1_FUNCTIONS(EC_PRIVATEKEY
)
235 DECLARE_ASN1_ENCODE_FUNCTIONS_name(EC_PRIVATEKEY
, EC_PRIVATEKEY
)
236 IMPLEMENT_ASN1_FUNCTIONS(EC_PRIVATEKEY
)
238 /* some declarations of internal function */
240 /* ec_asn1_group2field() sets the values in a X9_62_FIELDID object */
241 static int ec_asn1_group2fieldid(const EC_GROUP
*, X9_62_FIELDID
*);
242 /* ec_asn1_group2curve() sets the values in a X9_62_CURVE object */
243 static int ec_asn1_group2curve(const EC_GROUP
*, X9_62_CURVE
*);
245 /* the function definitions */
247 static int ec_asn1_group2fieldid(const EC_GROUP
*group
, X9_62_FIELDID
*field
)
252 if (group
== NULL
|| field
== NULL
)
255 /* clear the old values (if necessary) */
256 ASN1_OBJECT_free(field
->fieldType
);
257 ASN1_TYPE_free(field
->p
.other
);
259 nid
= EC_METHOD_get_field_type(EC_GROUP_method_of(group
));
260 /* set OID for the field */
261 if ((field
->fieldType
= OBJ_nid2obj(nid
)) == NULL
) {
262 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_OBJ_LIB
);
266 if (nid
== NID_X9_62_prime_field
) {
267 if ((tmp
= BN_new()) == NULL
) {
268 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
271 /* the parameters are specified by the prime number p */
272 if (!EC_GROUP_get_curve(group
, tmp
, NULL
, NULL
, NULL
)) {
273 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_EC_LIB
);
276 /* set the prime number */
277 field
->p
.prime
= BN_to_ASN1_INTEGER(tmp
, NULL
);
278 if (field
->p
.prime
== NULL
) {
279 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_ASN1_LIB
);
282 } else if (nid
== NID_X9_62_characteristic_two_field
)
283 #ifdef OPENSSL_NO_EC2M
285 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, EC_R_GF2M_NOT_SUPPORTED
);
291 X9_62_CHARACTERISTIC_TWO
*char_two
;
293 field
->p
.char_two
= X9_62_CHARACTERISTIC_TWO_new();
294 char_two
= field
->p
.char_two
;
296 if (char_two
== NULL
) {
297 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
301 char_two
->m
= (long)EC_GROUP_get_degree(group
);
303 field_type
= EC_GROUP_get_basis_type(group
);
305 if (field_type
== 0) {
306 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_EC_LIB
);
309 /* set base type OID */
310 if ((char_two
->type
= OBJ_nid2obj(field_type
)) == NULL
) {
311 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_OBJ_LIB
);
315 if (field_type
== NID_X9_62_tpBasis
) {
318 if (!EC_GROUP_get_trinomial_basis(group
, &k
))
321 char_two
->p
.tpBasis
= ASN1_INTEGER_new();
322 if (char_two
->p
.tpBasis
== NULL
) {
323 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
326 if (!ASN1_INTEGER_set(char_two
->p
.tpBasis
, (long)k
)) {
327 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_ASN1_LIB
);
330 } else if (field_type
== NID_X9_62_ppBasis
) {
331 unsigned int k1
, k2
, k3
;
333 if (!EC_GROUP_get_pentanomial_basis(group
, &k1
, &k2
, &k3
))
336 char_two
->p
.ppBasis
= X9_62_PENTANOMIAL_new();
337 if (char_two
->p
.ppBasis
== NULL
) {
338 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
343 char_two
->p
.ppBasis
->k1
= (long)k1
;
344 char_two
->p
.ppBasis
->k2
= (long)k2
;
345 char_two
->p
.ppBasis
->k3
= (long)k3
;
346 } else { /* field_type == NID_X9_62_onBasis */
348 /* for ONB the parameters are (asn1) NULL */
349 char_two
->p
.onBasis
= ASN1_NULL_new();
350 if (char_two
->p
.onBasis
== NULL
) {
351 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, ERR_R_MALLOC_FAILURE
);
358 ECerr(EC_F_EC_ASN1_GROUP2FIELDID
, EC_R_UNSUPPORTED_FIELD
);
369 static int ec_asn1_group2curve(const EC_GROUP
*group
, X9_62_CURVE
*curve
)
372 BIGNUM
*tmp_1
= NULL
, *tmp_2
= NULL
;
373 unsigned char *a_buf
= NULL
, *b_buf
= NULL
;
376 if (!group
|| !curve
|| !curve
->a
|| !curve
->b
)
379 if ((tmp_1
= BN_new()) == NULL
|| (tmp_2
= BN_new()) == NULL
) {
380 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_MALLOC_FAILURE
);
385 if (!EC_GROUP_get_curve(group
, NULL
, tmp_1
, tmp_2
, NULL
)) {
386 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_EC_LIB
);
391 * Per SEC 1, the curve coefficients must be padded up to size. See C.2's
392 * definition of Curve, C.1's definition of FieldElement, and 2.3.5's
393 * definition of how to encode the field elements.
395 len
= ((size_t)EC_GROUP_get_degree(group
) + 7) / 8;
396 if ((a_buf
= OPENSSL_malloc(len
)) == NULL
397 || (b_buf
= OPENSSL_malloc(len
)) == NULL
) {
398 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_MALLOC_FAILURE
);
401 if (BN_bn2binpad(tmp_1
, a_buf
, len
) < 0
402 || BN_bn2binpad(tmp_2
, b_buf
, len
) < 0) {
403 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_BN_LIB
);
408 if (!ASN1_OCTET_STRING_set(curve
->a
, a_buf
, len
)
409 || !ASN1_OCTET_STRING_set(curve
->b
, b_buf
, len
)) {
410 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_ASN1_LIB
);
414 /* set the seed (optional) */
417 if ((curve
->seed
= ASN1_BIT_STRING_new()) == NULL
) {
418 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_MALLOC_FAILURE
);
421 curve
->seed
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
| 0x07);
422 curve
->seed
->flags
|= ASN1_STRING_FLAG_BITS_LEFT
;
423 if (!ASN1_BIT_STRING_set(curve
->seed
, group
->seed
,
424 (int)group
->seed_len
)) {
425 ECerr(EC_F_EC_ASN1_GROUP2CURVE
, ERR_R_ASN1_LIB
);
429 ASN1_BIT_STRING_free(curve
->seed
);
443 ECPARAMETERS
*EC_GROUP_get_ecparameters(const EC_GROUP
*group
,
444 ECPARAMETERS
*params
)
447 ECPARAMETERS
*ret
= NULL
;
449 unsigned char *buffer
= NULL
;
450 const EC_POINT
*point
= NULL
;
451 point_conversion_form_t form
;
454 if (params
== NULL
) {
455 if ((ret
= ECPARAMETERS_new()) == NULL
) {
456 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_MALLOC_FAILURE
);
462 /* set the version (always one) */
463 ret
->version
= (long)0x1;
465 /* set the fieldID */
466 if (!ec_asn1_group2fieldid(group
, ret
->fieldID
)) {
467 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_EC_LIB
);
472 if (!ec_asn1_group2curve(group
, ret
->curve
)) {
473 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_EC_LIB
);
477 /* set the base point */
478 if ((point
= EC_GROUP_get0_generator(group
)) == NULL
) {
479 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, EC_R_UNDEFINED_GENERATOR
);
483 form
= EC_GROUP_get_point_conversion_form(group
);
485 len
= EC_POINT_point2buf(group
, point
, form
, &buffer
, NULL
);
487 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_EC_LIB
);
490 if (ret
->base
== NULL
&& (ret
->base
= ASN1_OCTET_STRING_new()) == NULL
) {
491 OPENSSL_free(buffer
);
492 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_MALLOC_FAILURE
);
495 ASN1_STRING_set0(ret
->base
, buffer
, len
);
498 tmp
= EC_GROUP_get0_order(group
);
500 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_EC_LIB
);
503 ret
->order
= BN_to_ASN1_INTEGER(tmp
, orig
= ret
->order
);
504 if (ret
->order
== NULL
) {
506 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_ASN1_LIB
);
510 /* set the cofactor (optional) */
511 tmp
= EC_GROUP_get0_cofactor(group
);
513 ret
->cofactor
= BN_to_ASN1_INTEGER(tmp
, orig
= ret
->cofactor
);
514 if (ret
->cofactor
== NULL
) {
515 ret
->cofactor
= orig
;
516 ECerr(EC_F_EC_GROUP_GET_ECPARAMETERS
, ERR_R_ASN1_LIB
);
525 ECPARAMETERS_free(ret
);
529 ECPKPARAMETERS
*EC_GROUP_get_ecpkparameters(const EC_GROUP
*group
,
530 ECPKPARAMETERS
*params
)
533 ECPKPARAMETERS
*ret
= params
;
536 if ((ret
= ECPKPARAMETERS_new()) == NULL
) {
537 ECerr(EC_F_EC_GROUP_GET_ECPKPARAMETERS
, ERR_R_MALLOC_FAILURE
);
542 ASN1_OBJECT_free(ret
->value
.named_curve
);
543 else if (ret
->type
== 1 && ret
->value
.parameters
)
544 ECPARAMETERS_free(ret
->value
.parameters
);
547 if (EC_GROUP_get_asn1_flag(group
)) {
549 * use the asn1 OID to describe the elliptic curve parameters
551 tmp
= EC_GROUP_get_curve_name(group
);
554 if ((ret
->value
.named_curve
= OBJ_nid2obj(tmp
)) == NULL
)
557 /* we don't know the nid => ERROR */
560 /* use the ECPARAMETERS structure */
562 if ((ret
->value
.parameters
=
563 EC_GROUP_get_ecparameters(group
, NULL
)) == NULL
)
568 ECPKPARAMETERS_free(ret
);
574 EC_GROUP
*EC_GROUP_new_from_ecparameters(const ECPARAMETERS
*params
)
577 EC_GROUP
*ret
= NULL
, *dup
= NULL
;
578 BIGNUM
*p
= NULL
, *a
= NULL
, *b
= NULL
;
579 EC_POINT
*point
= NULL
;
581 int curve_name
= NID_undef
;
584 if (params
->fieldID
== NULL
585 || params
->fieldID
->fieldType
== NULL
586 || params
->fieldID
->p
.ptr
== NULL
) {
587 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
592 * Now extract the curve parameters a and b. Note that, although SEC 1
593 * specifies the length of their encodings, historical versions of OpenSSL
594 * encoded them incorrectly, so we must accept any length for backwards
597 if (params
->curve
== NULL
598 || params
->curve
->a
== NULL
|| params
->curve
->a
->data
== NULL
599 || params
->curve
->b
== NULL
|| params
->curve
->b
->data
== NULL
) {
600 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
603 a
= BN_bin2bn(params
->curve
->a
->data
, params
->curve
->a
->length
, NULL
);
605 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_BN_LIB
);
608 b
= BN_bin2bn(params
->curve
->b
->data
, params
->curve
->b
->length
, NULL
);
610 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_BN_LIB
);
614 /* get the field parameters */
615 tmp
= OBJ_obj2nid(params
->fieldID
->fieldType
);
616 if (tmp
== NID_X9_62_characteristic_two_field
)
617 #ifdef OPENSSL_NO_EC2M
619 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_GF2M_NOT_SUPPORTED
);
624 X9_62_CHARACTERISTIC_TWO
*char_two
;
626 char_two
= params
->fieldID
->p
.char_two
;
628 field_bits
= char_two
->m
;
629 if (field_bits
> OPENSSL_ECC_MAX_FIELD_BITS
) {
630 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_FIELD_TOO_LARGE
);
634 if ((p
= BN_new()) == NULL
) {
635 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_MALLOC_FAILURE
);
639 /* get the base type */
640 tmp
= OBJ_obj2nid(char_two
->type
);
642 if (tmp
== NID_X9_62_tpBasis
) {
645 if (!char_two
->p
.tpBasis
) {
646 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
650 tmp_long
= ASN1_INTEGER_get(char_two
->p
.tpBasis
);
652 if (!(char_two
->m
> tmp_long
&& tmp_long
> 0)) {
653 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
,
654 EC_R_INVALID_TRINOMIAL_BASIS
);
658 /* create the polynomial */
659 if (!BN_set_bit(p
, (int)char_two
->m
))
661 if (!BN_set_bit(p
, (int)tmp_long
))
663 if (!BN_set_bit(p
, 0))
665 } else if (tmp
== NID_X9_62_ppBasis
) {
666 X9_62_PENTANOMIAL
*penta
;
668 penta
= char_two
->p
.ppBasis
;
670 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
675 (char_two
->m
> penta
->k3
&& penta
->k3
> penta
->k2
676 && penta
->k2
> penta
->k1
&& penta
->k1
> 0)) {
677 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
,
678 EC_R_INVALID_PENTANOMIAL_BASIS
);
682 /* create the polynomial */
683 if (!BN_set_bit(p
, (int)char_two
->m
))
685 if (!BN_set_bit(p
, (int)penta
->k1
))
687 if (!BN_set_bit(p
, (int)penta
->k2
))
689 if (!BN_set_bit(p
, (int)penta
->k3
))
691 if (!BN_set_bit(p
, 0))
693 } else if (tmp
== NID_X9_62_onBasis
) {
694 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_NOT_IMPLEMENTED
);
698 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
702 /* create the EC_GROUP structure */
703 ret
= EC_GROUP_new_curve_GF2m(p
, a
, b
, NULL
);
706 else if (tmp
== NID_X9_62_prime_field
) {
707 /* we have a curve over a prime field */
708 /* extract the prime number */
709 if (params
->fieldID
->p
.prime
== NULL
) {
710 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
713 p
= ASN1_INTEGER_to_BN(params
->fieldID
->p
.prime
, NULL
);
715 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_ASN1_LIB
);
719 if (BN_is_negative(p
) || BN_is_zero(p
)) {
720 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_INVALID_FIELD
);
724 field_bits
= BN_num_bits(p
);
725 if (field_bits
> OPENSSL_ECC_MAX_FIELD_BITS
) {
726 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_FIELD_TOO_LARGE
);
730 /* create the EC_GROUP structure */
731 ret
= EC_GROUP_new_curve_GFp(p
, a
, b
, NULL
);
733 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_INVALID_FIELD
);
738 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_EC_LIB
);
742 /* extract seed (optional) */
743 if (params
->curve
->seed
!= NULL
) {
744 OPENSSL_free(ret
->seed
);
745 if ((ret
->seed
= OPENSSL_malloc(params
->curve
->seed
->length
)) == NULL
) {
746 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_MALLOC_FAILURE
);
749 memcpy(ret
->seed
, params
->curve
->seed
->data
,
750 params
->curve
->seed
->length
);
751 ret
->seed_len
= params
->curve
->seed
->length
;
754 if (params
->order
== NULL
755 || params
->base
== NULL
756 || params
->base
->data
== NULL
) {
757 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_ASN1_ERROR
);
761 if ((point
= EC_POINT_new(ret
)) == NULL
)
764 /* set the point conversion form */
765 EC_GROUP_set_point_conversion_form(ret
, (point_conversion_form_t
)
766 (params
->base
->data
[0] & ~0x01));
768 /* extract the ec point */
769 if (!EC_POINT_oct2point(ret
, point
, params
->base
->data
,
770 params
->base
->length
, NULL
)) {
771 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_EC_LIB
);
775 /* extract the order */
776 if ((a
= ASN1_INTEGER_to_BN(params
->order
, a
)) == NULL
) {
777 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_ASN1_LIB
);
780 if (BN_is_negative(a
) || BN_is_zero(a
)) {
781 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_INVALID_GROUP_ORDER
);
784 if (BN_num_bits(a
) > (int)field_bits
+ 1) { /* Hasse bound */
785 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, EC_R_INVALID_GROUP_ORDER
);
789 /* extract the cofactor (optional) */
790 if (params
->cofactor
== NULL
) {
793 } else if ((b
= ASN1_INTEGER_to_BN(params
->cofactor
, b
)) == NULL
) {
794 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_ASN1_LIB
);
797 /* set the generator, order and cofactor (if present) */
798 if (!EC_GROUP_set_generator(ret
, point
, a
, b
)) {
799 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_EC_LIB
);
804 * Check if the explicit parameters group just created matches one of the
807 * We create a copy of the group just built, so that we can remove optional
808 * fields for the lookup: we do this to avoid the possibility that one of
809 * the optional parameters is used to force the library into using a less
810 * performant and less secure EC_METHOD instead of the specialized one.
811 * In any case, `seed` is not really used in any computation, while a
812 * cofactor different from the one in the built-in table is just
813 * mathematically wrong anyway and should not be used.
815 if ((ctx
= BN_CTX_new()) == NULL
) {
816 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_BN_LIB
);
819 if ((dup
= EC_GROUP_dup(ret
)) == NULL
820 || EC_GROUP_set_seed(dup
, NULL
, 0) != 1
821 || !EC_GROUP_set_generator(dup
, point
, a
, NULL
)) {
822 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_EC_LIB
);
825 if ((curve_name
= ec_curve_nid_from_params(dup
, ctx
)) != NID_undef
) {
827 * The input explicit parameters successfully matched one of the
828 * built-in curves: often for built-in curves we have specialized
829 * methods with better performance and hardening.
831 * In this case we replace the `EC_GROUP` created through explicit
832 * parameters with one created from a named group.
834 EC_GROUP
*named_group
= NULL
;
836 #ifndef OPENSSL_NO_EC_NISTP_64_GCC_128
838 * NID_wap_wsg_idm_ecid_wtls12 and NID_secp224r1 are both aliases for
839 * the same curve, we prefer the SECP nid when matching explicit
840 * parameters as that is associated with a specialized EC_METHOD.
842 if (curve_name
== NID_wap_wsg_idm_ecid_wtls12
)
843 curve_name
= NID_secp224r1
;
844 #endif /* !def(OPENSSL_NO_EC_NISTP_64_GCC_128) */
846 if ((named_group
= EC_GROUP_new_by_curve_name(curve_name
)) == NULL
) {
847 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPARAMETERS
, ERR_R_EC_LIB
);
854 * Set the flag so that EC_GROUPs created from explicit parameters are
855 * serialized using explicit parameters by default.
857 EC_GROUP_set_asn1_flag(ret
, OPENSSL_EC_EXPLICIT_CURVE
);
860 * If the input params do not contain the optional seed field we make
861 * sure it is not added to the returned group.
863 * The seed field is not really used inside libcrypto anyway, and
864 * adding it to parsed explicit parameter keys would alter their DER
865 * encoding output (because of the extra field) which could impact
866 * applications fingerprinting keys by their DER encoding.
868 if (params
->curve
->seed
== NULL
) {
869 if (EC_GROUP_set_seed(ret
, NULL
, 0) != 1)
886 EC_POINT_free(point
);
893 EC_GROUP
*EC_GROUP_new_from_ecpkparameters(const ECPKPARAMETERS
*params
)
895 EC_GROUP
*ret
= NULL
;
898 if (params
== NULL
) {
899 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS
, EC_R_MISSING_PARAMETERS
);
903 if (params
->type
== 0) { /* the curve is given by an OID */
904 tmp
= OBJ_obj2nid(params
->value
.named_curve
);
905 if ((ret
= EC_GROUP_new_by_curve_name(tmp
)) == NULL
) {
906 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS
,
907 EC_R_EC_GROUP_NEW_BY_NAME_FAILURE
);
910 EC_GROUP_set_asn1_flag(ret
, OPENSSL_EC_NAMED_CURVE
);
911 } else if (params
->type
== 1) { /* the parameters are given by a
912 * ECPARAMETERS structure */
913 ret
= EC_GROUP_new_from_ecparameters(params
->value
.parameters
);
915 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS
, ERR_R_EC_LIB
);
918 EC_GROUP_set_asn1_flag(ret
, OPENSSL_EC_EXPLICIT_CURVE
);
919 } else if (params
->type
== 2) { /* implicitlyCA */
922 ECerr(EC_F_EC_GROUP_NEW_FROM_ECPKPARAMETERS
, EC_R_ASN1_ERROR
);
929 /* EC_GROUP <-> DER encoding of ECPKPARAMETERS */
931 EC_GROUP
*d2i_ECPKParameters(EC_GROUP
**a
, const unsigned char **in
, long len
)
933 EC_GROUP
*group
= NULL
;
934 ECPKPARAMETERS
*params
= NULL
;
935 const unsigned char *p
= *in
;
937 if ((params
= d2i_ECPKPARAMETERS(NULL
, &p
, len
)) == NULL
) {
938 ECerr(EC_F_D2I_ECPKPARAMETERS
, EC_R_D2I_ECPKPARAMETERS_FAILURE
);
939 ECPKPARAMETERS_free(params
);
943 if ((group
= EC_GROUP_new_from_ecpkparameters(params
)) == NULL
) {
944 ECerr(EC_F_D2I_ECPKPARAMETERS
, EC_R_PKPARAMETERS2GROUP_FAILURE
);
945 ECPKPARAMETERS_free(params
);
954 ECPKPARAMETERS_free(params
);
959 int i2d_ECPKParameters(const EC_GROUP
*a
, unsigned char **out
)
962 ECPKPARAMETERS
*tmp
= EC_GROUP_get_ecpkparameters(a
, NULL
);
964 ECerr(EC_F_I2D_ECPKPARAMETERS
, EC_R_GROUP2PKPARAMETERS_FAILURE
);
967 if ((ret
= i2d_ECPKPARAMETERS(tmp
, out
)) == 0) {
968 ECerr(EC_F_I2D_ECPKPARAMETERS
, EC_R_I2D_ECPKPARAMETERS_FAILURE
);
969 ECPKPARAMETERS_free(tmp
);
972 ECPKPARAMETERS_free(tmp
);
976 /* some EC_KEY functions */
978 EC_KEY
*d2i_ECPrivateKey(EC_KEY
**a
, const unsigned char **in
, long len
)
981 EC_PRIVATEKEY
*priv_key
= NULL
;
982 const unsigned char *p
= *in
;
984 if ((priv_key
= d2i_EC_PRIVATEKEY(NULL
, &p
, len
)) == NULL
) {
985 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
989 if (a
== NULL
|| *a
== NULL
) {
990 if ((ret
= EC_KEY_new()) == NULL
) {
991 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_MALLOC_FAILURE
);
997 if (priv_key
->parameters
) {
998 EC_GROUP_free(ret
->group
);
999 ret
->group
= EC_GROUP_new_from_ecpkparameters(priv_key
->parameters
);
1002 if (ret
->group
== NULL
) {
1003 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1007 ret
->version
= priv_key
->version
;
1009 if (priv_key
->privateKey
) {
1010 ASN1_OCTET_STRING
*pkey
= priv_key
->privateKey
;
1011 if (EC_KEY_oct2priv(ret
, ASN1_STRING_get0_data(pkey
),
1012 ASN1_STRING_length(pkey
)) == 0)
1015 ECerr(EC_F_D2I_ECPRIVATEKEY
, EC_R_MISSING_PRIVATE_KEY
);
1019 EC_POINT_clear_free(ret
->pub_key
);
1020 ret
->pub_key
= EC_POINT_new(ret
->group
);
1021 if (ret
->pub_key
== NULL
) {
1022 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1026 if (priv_key
->publicKey
) {
1027 const unsigned char *pub_oct
;
1030 pub_oct
= ASN1_STRING_get0_data(priv_key
->publicKey
);
1031 pub_oct_len
= ASN1_STRING_length(priv_key
->publicKey
);
1032 if (!EC_KEY_oct2key(ret
, pub_oct
, pub_oct_len
, NULL
)) {
1033 ECerr(EC_F_D2I_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1037 if (ret
->group
->meth
->keygenpub
== NULL
1038 || ret
->group
->meth
->keygenpub(ret
) == 0)
1040 /* Remember the original private-key-only encoding. */
1041 ret
->enc_flag
|= EC_PKEY_NO_PUBKEY
;
1046 EC_PRIVATEKEY_free(priv_key
);
1051 if (a
== NULL
|| *a
!= ret
)
1053 EC_PRIVATEKEY_free(priv_key
);
1057 int i2d_ECPrivateKey(const EC_KEY
*a
, unsigned char **out
)
1059 int ret
= 0, ok
= 0;
1060 unsigned char *priv
= NULL
, *pub
= NULL
;
1061 size_t privlen
= 0, publen
= 0;
1063 EC_PRIVATEKEY
*priv_key
= NULL
;
1065 if (a
== NULL
|| a
->group
== NULL
||
1066 (!(a
->enc_flag
& EC_PKEY_NO_PUBKEY
) && a
->pub_key
== NULL
)) {
1067 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_PASSED_NULL_PARAMETER
);
1071 if ((priv_key
= EC_PRIVATEKEY_new()) == NULL
) {
1072 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_MALLOC_FAILURE
);
1076 priv_key
->version
= a
->version
;
1078 privlen
= EC_KEY_priv2buf(a
, &priv
);
1081 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1085 ASN1_STRING_set0(priv_key
->privateKey
, priv
, privlen
);
1088 if (!(a
->enc_flag
& EC_PKEY_NO_PARAMETERS
)) {
1089 if ((priv_key
->parameters
=
1090 EC_GROUP_get_ecpkparameters(a
->group
,
1091 priv_key
->parameters
)) == NULL
) {
1092 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1097 if (!(a
->enc_flag
& EC_PKEY_NO_PUBKEY
)) {
1098 priv_key
->publicKey
= ASN1_BIT_STRING_new();
1099 if (priv_key
->publicKey
== NULL
) {
1100 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_MALLOC_FAILURE
);
1104 publen
= EC_KEY_key2buf(a
, a
->conv_form
, &pub
, NULL
);
1107 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1111 priv_key
->publicKey
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
| 0x07);
1112 priv_key
->publicKey
->flags
|= ASN1_STRING_FLAG_BITS_LEFT
;
1113 ASN1_STRING_set0(priv_key
->publicKey
, pub
, publen
);
1117 if ((ret
= i2d_EC_PRIVATEKEY(priv_key
, out
)) == 0) {
1118 ECerr(EC_F_I2D_ECPRIVATEKEY
, ERR_R_EC_LIB
);
1123 OPENSSL_clear_free(priv
, privlen
);
1125 EC_PRIVATEKEY_free(priv_key
);
1126 return (ok
? ret
: 0);
1129 int i2d_ECParameters(const EC_KEY
*a
, unsigned char **out
)
1132 ECerr(EC_F_I2D_ECPARAMETERS
, ERR_R_PASSED_NULL_PARAMETER
);
1135 return i2d_ECPKParameters(a
->group
, out
);
1138 EC_KEY
*d2i_ECParameters(EC_KEY
**a
, const unsigned char **in
, long len
)
1142 if (in
== NULL
|| *in
== NULL
) {
1143 ECerr(EC_F_D2I_ECPARAMETERS
, ERR_R_PASSED_NULL_PARAMETER
);
1147 if (a
== NULL
|| *a
== NULL
) {
1148 if ((ret
= EC_KEY_new()) == NULL
) {
1149 ECerr(EC_F_D2I_ECPARAMETERS
, ERR_R_MALLOC_FAILURE
);
1155 if (!d2i_ECPKParameters(&ret
->group
, in
, len
)) {
1156 ECerr(EC_F_D2I_ECPARAMETERS
, ERR_R_EC_LIB
);
1157 if (a
== NULL
|| *a
!= ret
)
1168 EC_KEY
*o2i_ECPublicKey(EC_KEY
**a
, const unsigned char **in
, long len
)
1172 if (a
== NULL
|| (*a
) == NULL
|| (*a
)->group
== NULL
) {
1174 * sorry, but a EC_GROUP-structure is necessary to set the public key
1176 ECerr(EC_F_O2I_ECPUBLICKEY
, ERR_R_PASSED_NULL_PARAMETER
);
1180 if (!EC_KEY_oct2key(ret
, *in
, len
, NULL
)) {
1181 ECerr(EC_F_O2I_ECPUBLICKEY
, ERR_R_EC_LIB
);
1188 int i2o_ECPublicKey(const EC_KEY
*a
, unsigned char **out
)
1194 ECerr(EC_F_I2O_ECPUBLICKEY
, ERR_R_PASSED_NULL_PARAMETER
);
1198 buf_len
= EC_POINT_point2oct(a
->group
, a
->pub_key
,
1199 a
->conv_form
, NULL
, 0, NULL
);
1201 if (out
== NULL
|| buf_len
== 0)
1202 /* out == NULL => just return the length of the octet string */
1206 if ((*out
= OPENSSL_malloc(buf_len
)) == NULL
) {
1207 ECerr(EC_F_I2O_ECPUBLICKEY
, ERR_R_MALLOC_FAILURE
);
1212 if (!EC_POINT_point2oct(a
->group
, a
->pub_key
, a
->conv_form
,
1213 *out
, buf_len
, NULL
)) {
1214 ECerr(EC_F_I2O_ECPUBLICKEY
, ERR_R_EC_LIB
);
1226 DECLARE_ASN1_FUNCTIONS(ECDSA_SIG
)
1227 DECLARE_ASN1_ENCODE_FUNCTIONS_name(ECDSA_SIG
, ECDSA_SIG
)
1229 #endif /* FIPS_MODE */
1231 ECDSA_SIG
*ECDSA_SIG_new(void)
1233 ECDSA_SIG
*sig
= OPENSSL_zalloc(sizeof(*sig
));
1235 ECerr(EC_F_ECDSA_SIG_NEW
, ERR_R_MALLOC_FAILURE
);
1239 void ECDSA_SIG_free(ECDSA_SIG
*sig
)
1243 BN_clear_free(sig
->r
);
1244 BN_clear_free(sig
->s
);
1248 ECDSA_SIG
*d2i_ECDSA_SIG(ECDSA_SIG
**psig
, const unsigned char **ppin
, long len
)
1254 if (psig
!= NULL
&& *psig
!= NULL
) {
1257 sig
= ECDSA_SIG_new();
1265 if (decode_der_dsa_sig(sig
->r
, sig
->s
, ppin
, (size_t)len
) == 0) {
1266 if (psig
== NULL
|| *psig
== NULL
)
1267 ECDSA_SIG_free(sig
);
1270 if (psig
!= NULL
&& *psig
== NULL
)
1275 int i2d_ECDSA_SIG(const ECDSA_SIG
*sig
, unsigned char **ppout
)
1277 BUF_MEM
*buf
= NULL
;
1281 if (ppout
== NULL
) {
1282 if (!WPACKET_init_null(&pkt
, 0))
1284 } else if (*ppout
== NULL
) {
1285 if ((buf
= BUF_MEM_new()) == NULL
1286 || !WPACKET_init_len(&pkt
, buf
, 0)) {
1291 if (!WPACKET_init_static_len(&pkt
, *ppout
, SIZE_MAX
, 0))
1295 if (!encode_der_dsa_sig(&pkt
, sig
->r
, sig
->s
)
1296 || !WPACKET_get_total_written(&pkt
, &encoded_len
)
1297 || !WPACKET_finish(&pkt
)) {
1299 WPACKET_cleanup(&pkt
);
1303 if (ppout
!= NULL
) {
1304 if (*ppout
== NULL
) {
1305 *ppout
= (unsigned char *)buf
->data
;
1309 *ppout
+= encoded_len
;
1313 return (int)encoded_len
;
1316 void ECDSA_SIG_get0(const ECDSA_SIG
*sig
, const BIGNUM
**pr
, const BIGNUM
**ps
)
1324 const BIGNUM
*ECDSA_SIG_get0_r(const ECDSA_SIG
*sig
)
1329 const BIGNUM
*ECDSA_SIG_get0_s(const ECDSA_SIG
*sig
)
1334 int ECDSA_SIG_set0(ECDSA_SIG
*sig
, BIGNUM
*r
, BIGNUM
*s
)
1336 if (r
== NULL
|| s
== NULL
)
1338 BN_clear_free(sig
->r
);
1339 BN_clear_free(sig
->s
);
1345 int ECDSA_size(const EC_KEY
*ec
)
1349 const EC_GROUP
*group
;
1354 group
= EC_KEY_get0_group(ec
);
1358 bn
= EC_GROUP_get0_order(group
);
1362 sig
.r
= sig
.s
= (BIGNUM
*)bn
;
1363 ret
= i2d_ECDSA_SIG(&sig
, NULL
);